Core pulling and ejecting mechanism



Jan. 2, 1934. L. H. MORIN CORE PULLING AND EJECTING MECHANISM OriginalFiled Feb. 6. 1931 3 Sheets-Sheet l INVENTOR Maw ATTORNEY Jan. 2, 1934.L. H. MORIN CORE PULLING AND'EJECTING MECHANISM Original- Filed Feb. 6,1931 3 Sheets-Sheet 2 ATTORNEY Way Jan. 2, 1934. I L. H. MOR|N 3 5 COREPULLING AND EJECTING MECHANiSM Original Filed Feb. 6. 1931 sSheets-Sheet a \NVENTOR 7 may? ATTORNEY Patented Jan. 2, 1934 UNITEDSTATES PATENT OFFICE Louis B. Morin, New York, N. Y., assignor toDoehler Die-Casting 00., a corporation of New York Original applicationFebruary 6, 1931, Serial No. 513,803. Divided and this application April8, 1931. Serial No. 528,571

4 Claims.

My invention relates to die-casting machines in which metal is forcedunder pressure into a permanent mold or die. In particular, theinvention relates to core pulling and ejecting mechanism for suchmachines.

Die-casting machines, in general, comprise a stationary die plate and amovable die plate to which die-parts are secured, the die-parts carriedby the plates constituting a complete die. The movable die plate ismovable with respect to the stationary die plate to move the die-partcarried thereby into and out of operative relation with the die-partsecured to the stationary die plate. The mold cavities of the die-partsare so formed that the metal forced into the mold cavity of the die,when the die-parts are in operative relation, remains in the die-partsecured to the movable die plate when the plate is moved to separate thedie-parts. The cast metal so remaining in the cavity of the movabledie-part must be ejected therefrom so that when the dieparts are againbrought together they will be in condition to receive another charge ofmolten metal. Where core pins are used to form openings in the castingsproduced, these pins must .be withdrawn from the mold cavity of the diebefore the casting is ejected.

In accordance with my invention, the core pins are withdrawn from themold cavity of the die, and the casting is ejected automatically. Thecore pulling and ejecting mechanism are positive in their operation, andare effective by virtue of relative movement with respect to the movabledie plate.

An advantage of my invention is the fact that core pins at an angle tothe line of movement of the movable die plate may be withdrawn andinserted by the core pulling mechanism.

Specifically, I provide a stationary die plate which is secured to thepressure end of themachine. This stationary die plate is adapted tocarry a die-part'in operativerelation with the pressure pot of thedie-casting machine. Slidably supported on rods extending from thepressure end of the machine there is a movable die plate. Thismovabledie plate carries an ejector box in which there are two plates, anejector plate and a core plate. The ejector box also carries a die-partwhich is, by virtue of the movement of the die plate, carried into andout of operative relation with the die-part secured to the stationarydie plate. The ejector plate and core plate are slidably mounted in theejector box and extend through the sides thereof. The ends of theejector plate extend through the sides of the ejector box and areconnected by means of rods to the frame of the machine. The rods areslidably mounted in lugs formed on the frame of the machine and areadapted to carry adjustable abutments which, on movement of the dieplate, abut against the hold the ejector plate stationary with respectto the frame. On each of the rods connected to the ends of the ejectorplate, there is an abutment on either side of the lug on the frame ofthe machine through which the rod passes. As the die plate moves in adirection to separate the dieparts, one of these abutments engages thelug on the frame, and holds the ejector plates stationary so thatejector pins, which are aligned with openings in the ejector box and thediepart carried thereby, extend into the mold cavity of the die-partupon relative movement of the die plate and the ejector plate. As thedie plate moves to close the dies, the abutment on the opposite side ofthe lug through which the rod passes engages the lug and holds theejector plate stationary so that relative movement of the die-part inthis direction causes the ejector .pins to be withdrawn from the moldcavity.

The movable die plate is actuated by a toggle mechanism. The ends of thecore plate extending through the ejector box carried by the movable dieplate are connected to the toggle mechanism for operating the die plate.The plate is connected to thetoggle mechanism so that when the togglemechanism isoperated to move the die plate, the core plate is moved inthe same direction as the die plate but relative thereto. The relativemovement of the core plate serves to withdraw and insert the coresdepending upon the direction of movement of the die plate.

Ifthe casting to be produced requires core pins at an angle to thedirection of movement of the movable core plate, these angular core pinsare secured to a rack which engages a pinion rotatably mounted in theejector box. Additional racks actuated by the core plate also engage thepinion so that movement of the core lugs on the frame and.

plate operates the pinions which in turn operate upon the racks to whichthe core pins are secured to withdraw and insert the angular core pins.

A clearer understanding of my invention will be had from the followingparticular description of one embodiment thereof which is shown in theaccompanying drawings in which:

Fig. 1 is a side elevation of the operating mechanism of a machineconstructed in accordance with my invention;

Fig. 2 is a plan of the same;

Fig. 3 is a fragmentary sectional plan showing the toggle mechanism foroperating the movable die plate;

Fig. 4 is a fragmentary sectional elevation of the operating mechanismof the machine; I

Fig. 5 is a fragmentary transverse, sectional elevation taken on theline 5-5 of Fig. 4; and

Fig. 6 is an enlarged fragmentary sectional plan of the ejector boxtaken on the line 6-6 of Fig. 1 and showing the die plate in the closedposition of the die-parts.

In the drawings, I have illustrated only the operating mechanism of adie-casting machine. A complete die-casting machine is shown in mycopending application Serial No. 513,803, filed February 6, 1931, ofwhich this application is a division. The mechanism illustrated may beused with any of the well known pressure ends of die-casting machines,and for this reason and for thepurpose of simplifying the drawings, thepressure end of the machine, which is well known to those skilled in theart, has been omitted.

The operating end of the machine'which is shown in the drawings ismounted in a frame which includes parallel side frame members 1 and atransverse frame member 2. The side frame members 1 are rigidly securedtogether in spaced relation by a series of transverse tie rods 3, andthe frame is rigidly secured in place with respect to the pressure endof the machine by four parallel frame rods 4 which are arranged in twoparallel planes. These frame rods are firmly secured to the pressure endof the machine, indicated by the member 5, in which the pressure pot ofthe machine 'is located. The frame rods extend perpendicular from themember 5 and through the side frame members 1, the two upper frame rodsextending through hub shaped projections 6 formed on the sides of theframe members in which they are slidably mounted, and the two lowerframe rods extend through the frame members 1 which have hub shapedportions 7 at each end through which the rods extend and in which theyare slidably mounted. The portion of each of the frame rods whichextends through the frame members 1 are threaded to receive nut 8 bymeans of which they are rigidly secured to the frame members, therebeing a nut on each side of the hubs through which the frame rodsextend. These frame rods are slidably mounted in the frame members sothat the frame may be adjusted with respect to the pressure end of themachine in' order to accommodate different sized dies.

To permit adjustment of the frame, with respect to the pressure end ofthe machine, the frame is supported through brackets 9 which extenddownwardly from, and forwardly of, the side frame members 1 to whichthey are rigidly secured. A shaft 10 extends between the brackets 9 andthrough aligned openings provided therefor in the brackets.- Adjacenteach bracket, there is rotatably mounted on theshaft 10 a flanged wheel11 which rests upon a track 12 supported by a base 13. When the nuts 3,on the frame rods 4, are loosened the frame may be moved on the flangedwheels 11' along the tracks 12 to the desired position, in whichposition the frame may be locked by the nuts 8. For moving the framealong the tracks 12, there is provided an adjusting screw 14 whichextends through the shaft 10 in threaded engagement therewith. The endof the adjusting screwopposite to the shaft 10 is rotatably mounted in aframe 15 which is pivoted between the arms of a bifurcated bracket 16.The frame 15 is pivoted to the bracket 16 between its ends, and on'theside of v the pivot opposite to that through which the adjusting screw14 extends it is provided with a hubin which a stub shaft 17 isrotatably mounted. The end of the adjusting screw extending through theframe 15 carries a spur gear 18 which is secured thereto and whichmeshes .with the spur gear 19 secured to the shaft 17. The end of theshaft 17 is provided with a hand wheel 20 which is secured thereto andby means of which the shaft 17, and consequently, the adjusting screw 14may be rotated to move the frame of the machine along the tracks 12.

Slidably mounted on the frame rods 4, there is a die plate 21 which isprovided with hub shaped portions 22 through which the frame rodsextend. The die plate is also provided with hub shaped portions 23 intowhich guide rods 24 extend, the guide rods extending from the die' plateperpendicular thereto and through the frame of the machine. These guiderods are substantially square in cross section and extend throughopenings in the frame members which are complementary in shape. The dieplate 21 is moved along the frame rods by' a toggle mechanism. Thetoggle mechanism includes two pairs of links, one pair at the top of themachine and the other pair midway of the machine and at the bottom ofthe die. plate. Each pair of links includes a link connected at one endto the frame of the machne, and a link pivotally connected at one end tothe die plate, the opposite ends of the links being pivotally connectedtogether. The link which is pivotally connected to the die plate has twoparallel arms 25 the ends of which extend between brackets 26 formed onthe dc plate and extending perpendicular therefrom, the arms of the linkbeing pivotally connected to the brackets on the die plate by a pivotpin 2'7. The two arms constituting the link are secured together andreinforced by cross members 28 which are formed integral therewith. Thelink 29 of each pair which is connected to the frame of the machine ispivotally mounted between the side frame members 1 on a pivot pin 30extending from the frame members. This link 29 is bifurcated at the endopposite to that secured to the frame members and the arms 29a of thebifurcated portion of the link are pivotally secured to the arms 25 ofthe other link of the pair by a pivot pin 31. The arms of the bifurcatedportion of the link 29 are strengthened by an integral cross piece 32.Between the arms 29a of the bifurcated link 29 there is mounted on thepivot pin 31 one end of a link 33. At the end opposite to that mountedon the pivot pin 31, the link 33 is also bifurcated. Each arm 33a and33b of the bifurcated portion of the link 33 is secured to a member 34which is slidably mounted on one of the guide rods 24 of the die plate,there being two such members 34 which are connected together andconstitute a cross head.

The toggle mechanism is actuated through the cross head comprising themembers 34 which is operated by cams 35 formed by recessing the sides ofa pair of gears 36, the cross head being operated by these cams througha system of links and L opposed faces of the gears 36, as shown in Fig.4, is such as to reciprocate a link between the gears and provided witha slot 39 through which the shaft 3'7 extends. The link 38 is providedwith a pair of cam followers 40 which are rotatably mounted therein andextend into the cam recesses in the gears 36. The link 38 extends abovethe gears 36 and at the upper end is pivotally secured to a link 41which link 41 consists of two parallel members spaced apart. The upperend of the link 38 extends between these members and is secured theretoby a pivot pin 42 extending between the members. The link 41 isfulcrumed, at one end, on a bracket 43 which extends between the membersof the link and which is secured to the transverse frame member 3 bymeans of a bolt 44. The opposite end of the link 41 is pivotallyconnected to a link 45 which extends between the link 41 and the crosshead members 34 to which it is also pivotally secured. Thus, as thegears 36 are rotated the link 38 is reciprocated in'a vertical plane andthe movement of the link 38 is translated into reciprocating movement ofthe cross head members 34 in a horizontal plane.

The gears 36 are operated through a drive shaft 46 through a train ofreducing gears. The drive shaft is journaled in the side frame membersand a bracket 47 extending from and secured to one of the frame members;Between the bracket 4'7 and the frame member to which it is securedthere is a drive pulley 48 rotatably mounted on the shaft 46. This drivepulley is connected to and disconnected from the shaft 46 by a clutchmechanism '49. The clutch mechanism may be any of the well known types.The mechanism illustrated is such that it is operated by sliding acollar 50 along the shaft 46, and for this purpose, there is provided abracket 51 having lugs, 52 extending into a circular groove formed onthe collar 50. The bracket 51 is secured to a shaft 53 which extendsalong the side of the machine and is journaled in hubs formed on theside of the machine.

' Intermediate of the ends of the shaft 53 there is a bracket 54 havingan arm 55 extending radially therefrom. Through this arm 55, a bolt 56extends which is secured in the side of the frame member. A convolutespring 5'7, surrounding the bolt, acts between a nut on the end of thebolt and the arm 55,'and the action of the spring is such as to move-theshaft 53 in a direction to operate the clutch mechanism to disengage thedrive pulley 48 from the shaft 46. For operating the clutch'to connectthe drive shaft 46 to the pulley 48 there is provided a handle 58 whichis secured to the end of the shaft 53. The bracket 54 is also providedwith an arm 59 which carries a cam. follower 60 in operative relation toa cam 61 secured on the end of the shaft 3'7. The cam 61 is such, havingone V-shaped' groove, that when the handle 58 is moved to cause theclutch 49 to connect the drive pulley 48 to the drive shaft 46, the camengaging the cam follower 60 on the bracket arm 59 will hold the clutchin the operative position while the shaft 37 makes one completerevolution.

On the drive shaft 46 there is mounted a pinion 62 which meshes with agear 63 that is rotatably mounted on a shaft 64 extending between theside frame members 1. On either side of the gear 63 there is a pinion 65secured thereto, the pinions meshing with the gears 36. All of the gearsare enclosed by a gear cover 66. On the drive shaft .6, there is alsomounted a brake mechanism 6'7 which is adapted to take up back-lash inthe 38 mounted From the above description of the mechanism' foroperating the movable die plate, it will be apparent that when theclutch is thrown in, the die plate will be reciprocated once. Theposition of the V-shaped notch in the cam 61 is such that the clutch isthrown out when the die plate is in operative position, that is, whenthe die-parts are together and in position to receive a charge of moltenmetal. On operation of the clutch mechanism, therefore, the movable die.plate will be moved to open and close the die.

The movable die plate carries an ejector box 68 which is securedthereto. The 'ejector box carries a die-part 69 which is adapted tocooperate with the die-part '7 0 carried by the stationary die plate '71which is secured to the member 5. The mold cavities of the die-parts areso formed that the metal cast in the die remains in the mold cavity ofthe die-part secured to the ejector box when the die-parts areseparated. The die illustrated in the drawings is provided with threecore pins, two lateral core pins '72 and '73, and a longitudinal corepin '74. The ends of the lateral core pins which extend through openingsin the ejector box are secured to lateral racks '75 and '76 by lugs '77.The lateral racks and '76 engage pinions 78 and '79 respectively whichare rotatably mounted in the ejector box. The pinions '78 and '79 arealso engaged by longitudinal racks 80 and 81 respectively. The dieshown, for the purposes of illustration, requires lateral core pins ofdifferent lengths which requires that the core pins be moved throughdifferent distances to insert or pull the cores. The longitudinal corepin likewise must be moved through a distance differing from thedistance which either of the lateral core pins must be moved. Thelongitudinal rack 81 which operates the longer of the two lateral corepins is secured in a core plate. The core plate consists of two plates82a and 82b which are secured together. The plate 82b is provided with arecess and an opening, the recess being at the base of the opening andadapted to receive a flange 83 formed on the end of the rack 81. Thus,when the two plates are secured together, the end of the rack is firmlysecured to the core plate. The longitudinal rack 80 extends through thecore plate which is provided with an opening therefor. The end of thelongitudinal rack 80 is threaded to receive a nut 84 which is of greaterdiameter than the opening in the core plate through which the rackextends and which is adapted to engage the core plate when the coreplate is moved in the direction of the nut. The longitudinal core pin'74 also extends through the core plate, and the end of the core pin isthreadedto receive a nut 85 which is adapted to engage the core plate.It will be seen, therefore, that as the core plate moves relative to thedie plate, in a direction away from the die plate it will move thelongitudinal racks, either by virtue of the fact that the rack issecured therein, or by engaging the nut on the end of the rack. Theracks, upon being moved by the core plate, will rotate the pinions '78and '79, which will move the racks '75 and '76 to move the core pins '72and '73. The longitudinal core pin will, of course, be drawn by theengagement of the core plate and the nut 85. On the return movement ofthe core plate, the racks and the longitudinal core pin are moved in theopposite direction by the engagement of the core plate with pins aremoved depends upon the character of their engagement with the coreplate.

The ends of the core plate extend through openings in the sides of theejector box, the core plate being slidably mounted in the ejector box.To each of the extended ends of the core plate, an operating rod 87 issecured and extends perpendicularly to the core plate along the side ofthe machine, the rods extending through projections 88 formed on thesides of the die plate and being supported thereby. The operating rods87 also extend through openings in projections 89 formed on the members34 which constitute the crosshead of the toggle mechanism. These rodsare slidably mounted in the projections 88 and 89. The portions of therods 87 which extend through the projections 89 on the cross-headmembers 34 are threaded to receive nuts 90 and 91 and 90' and 91 onopposite sides of the projections 89 which are adapted to engage theends of the projections. By the engagement of theprojections andthenuts. the core plate isv moved relative to the die plate and in the samedirection as the direction of movement of the die plate as thecross-head mem bers move a greater distance and at a greater speed thanthe die plate. Thus, as the cross-head moves in a direction to separatethe die-parts, the core plate will be moved relative to the die plate soas to withdraw the core pins, and as the die plate is moved in adirection to close the die-parts, the core plate will be moved in adirection to insert the core pins.

Within the ejector box, there is also an ejector plate 92. Like the coreplate, the ejector plate is composed of two plates secured together. Theplate towards the die is provided with a plurality of openings ending inconical recesses. Through these openings a plurality of ejector pins 93extend, the ejector pins having conical heads which are received in theconical recesses of the openings through the plate and are firmlysecured between the plates. When the dies are closed, in the positionshown in Fig. 6, the ejector pins extend through aligned openings in theejector box and the die-part carried thereby, the ends of the ejectorpins being flush with the surface of the mold cavity of the die-part.The ends of the ejector plate also extend through the sides of theejector box, and the ejector plate is slidably mounted in the ejectorbox. Each end of the ejector plate has a pair of lugs 94 formed thereonthrough which operating rods 95 extend, the ends of the rods beingsecured to the plate. The operating rods 95 extend perpendicularly tothe ejector plate along the sides of the frame and extend throughopenings in plates 96 which are secured to the side frame members 1.These operating rods are threaded throughout the portion which extendsthrough the openings in the plates and are slidably mounted in theopenings. The rods are provided with nuts 97 and 98 located on oppositeside of the plates. open the dies, to the position shown in Figs. 1 and2, the nuts 98 engage the plates 96 after the die plate has moved acertain distance, depending upon the position of the nuts 98, and holdthe ejector plate stationary with respect to the die plate so that asthe die plate continues to move, the ejectorpins are inserted in themold cavity of the die-part carried by the movable die to eject thecastingtherefrom. As the dieplateis returned to the position in whichthe dies are closed, as shown in Fig. 6, the ejector plate moves withthe die plate until the nuts 9'7 on the ends of the operating rods 95engage the plate 96 and hold the As the die plate moves to ejector platefrom further movement. Further movement of the die plate is thenrelative to the core plate and causes the ejector pins to be withdrawnfrom the mold cavity of the die-part carried by the movable die plate.

The operation of the machine is as follows: When the mold cavity of thedie has been charged with metal, the operator actuates the handle 58 tocause the clutch mechanism to connect the drive pulley 48 to the driveshaft 46. As the shaft 46 is rotated, the shaft 37 is also rotatedthrough the train of gears hereinbefore described and the cam 61 isrotated to engage the cam follower on the bracket 54 to hold the clutchin the operative position against the action of the spring 57. R0-tation of the gears 36, which are secured to the shaft 37, causes thelink 38 to be reciprocated, which, through the links 41 and 45, causesreciprocation of the cross-head members 34 on the guide rods 24. Whenthe machine is in the position shown in Fig. 6, the toggle mechanismlocks the movable die plate. As the link 38 is lifted by the cams in thegears 36, the cross-head members 34 are moved to break the toggle and'move the die plate 21 in a direction to separate the die-parts. It willbe obvious thatthe cross-head members 34 move at a greater speed thanthe movable die plate and, as hereinbefore described, the core plate,through the operating rods 87, will be moved relative to the die platein the same direction of movement of the die plate,-thereby withdrawingthe cores. The core plate will move with thedie plate until the nuts 98engage the plates 96 when further movement of the ejector plate will berestrained and the continued movement of the die plate will cause theejector pins to extend into the mold cavity of the die-part carriedthereby. As the link 38 is moved downwardly towards its initialposition, the reverse of the above operation will take place and theejector pins will be withdrawn, the core pins inserted, the die platemoved to close the dies and locked in that position by the togglemechanism. When the die plate has reached the closed position, the Vnotch in the cam 61 on the shaft 37 will have reached the cam followe;on the bracket 54. The spring 5'? will then actuate the shaft 53 tocause the clutching mechanism to break the connection between the drivepulley and. the drive shaft. The machine is then in position to repeatthe cycle just described.

It will 'be apparent that when the machine is started, further operationis automatic including the withdrawing of the core pins and the ejectingof the casting until the machine is returned to the position in which itis adapted to receive a charge of molten metal.

It is obvious that various changes may be made in the details of theembodiment disclosed in the drawings and above particularly described by13% those skilled in the art within the principle and scope of myinvention as expressed in the appended claims.

I claim:

1. In a die casting machine, a stationary frame, a die plate stationarywith respect to the frame, a die-part carried by the stationary dieplate, a movable die plate carried by the frame, an, ejector box carriedby the movable die plate, and having openings therethrough substantiallyperpendicular to the die plate, a die-part secured to the ejector boxand having a .mold cavity therein and openings therethrough in alignmentwith the openings in the ejector box and communicating with the moldcavity, means for 15- moving the movable die plate to carry the diepartthereon into and out of operative relation with the die-part secured tosaid stationary die plate, an ejector plate slidably mounted within theejector box and having the ends thereof extending through the sides ofthe ejector box,

ejector pins secured to the ejector plate and extending into the alignedopenings in the diepart and the ejector box, rods secured to the ends ofthe ejector plate and extending along the sides of the frame, lugs onthe frame in which the rods are slidably mounted, adjustable abutmentson the rods adapted to abut against said lugs to hold the ejector platestationary with respect to the movable die plate.

2. In a die-casting machine, in combination a stationary die plate,adapted to hold a die-part, a movable die plate, an ejector box carriedby the movable die plate, and adapted to carry a die-part, a togglejoint through which the movable die plate is actuated to move a die-partcarried by the ejector box into and out of operative relation with adie-part held by said stationary die plate, a slidably mounted memberconnected to said toggle joint, said slidably mounted member beingmovable in the direction of movement of said movable die plate andadapted to move the die plate through the toggle mechanism, a core platein the ejector box having its ends extending through the slides of theejector box and being slidably mounted therein, a lost motion connectionbetween the slidable member for operating the toggle mechanism and in, arod extending from said core plate and ative relation with a die-partheld by said stationary die plate, a slidably mounted member connectedto said toggle joint, said slidably mounted member being movable in thedirection of movement of said movable die plate and adapted to move thedie plate through the toggle mechanism, a core-plate in the ejector boxhaving its ends extending through the sides of the ejector box and beingslidably mounted thereslidably mounted in said slidable member,adjustable abutments on the rod adapted to engage said slidable member,and means for moving the slidable member.

4. In a die-casting machine, in combination a stationary die plate,adapted to hold a die-part, a movable die plate, an ejector box carriedby the movable die plate and adapted to carry a die-part, a toggle jointthrough which the movable die plate is actuated to move a die-partcarried by the ejector box into and out of operative relation with adie-part held by said stationary die plate, a slidably mounted memberconnected to said toggle joint, said slidably mounted member beingmovable in the direction of movement of said movable die plate andadapted to move the die plate through the toggle mechanism, a core platein the ejector box having its ends extending through the sides of theejector box and being slidably mounted therein; core pins parallel tothe core plate, and operatively related thereto, additional core-pinsangularly disposed with respect to the core plate and operativelyrelated thereto, a rod extending from said core plate and slidablymounted in said slidable member, adjustable abutments on the rod adaptedto engage said slidable member, means for moving the slidable member,and means for translating relative movement between the core plate andthe movable die plate into longitudinal movement of the core pins.

LOUIS H. MORIN.

